code: def test_isinstance():
      def fun(x):
          assert ag_isinstance(x, list)
          assert ag_isinstance(x, ag_list)
          return x[0]
  
      fun([1.0, 2.0, 3.0])
      grad(fun)([1.0, 2.0, 3.0])
  
file_path: autograd/tests/test_list.py
imports: import autograd.numpy
  import autograd.numpy.random
  from autograd.test_util import check_grads, check_vjp, check_jvp
  from autograd import grad
  from autograd import list, isinstance
label_desc: Use image node_id 6 for calling a global function with example usage: test_isinstance() and returns: x